Sources:
Executive Office of the President of the United States, Office of
Management and Budget (OMB), "Budget of the United States Government:
Appendix," Washington, D.C., annual issues, available at
http://www.gpoaccess.gov/usbudget/browse.html as of September, 2009.

Executive Office of the President
of the United States, Office of Management and Budget, "Budget of the
United States Government: Analytical Perspective, Detailed Functional
Tables, Washington, D.C., Annual issues, available at http://www.gpoaccess.gov/usbudget/browse.html as of September 2009.

U.S. Department of Commerce, Census
Bureau, "Statistical Abstract of the United States," Table 11.
Resident Population by Age and Sex, Available at
http://www.census.gov/compendia/statab/, as of November 2009.

U.S. Department of Commerce, Bureau
of Economic Analysis, "National Income Product Accounts Tables,"
table 3.9.4 available at http://www.bea.gov as of November 2009.